builddeb: fix missing headers in linux-headers package

The kernel headers package (linux-headers) doesn't include
header files from other architectures required to build
out-of-tree modules.

For e.g. on ARM64, opcodes.h includes the same file from ARM
which causes the following error:
./arch/arm64/include/asm/opcodes.h:1:43: fatal error:
../../arm/include/asm/opcodes.h: No such file or directory
compilation terminated.
Signed-off-by: Azriel Samson <asamson@codeaurora.org>
Signed-off-by: Michal Marek <mmarek@suse.com>

scripts/package/builddeb

@@ -325,7 +325,7 @@ fi
 if grep -q '^CONFIG_STACK_VALIDATION=y' $KCONFIG_CONFIG ; then
 	(cd $srctree; find tools/objtool -type f -executable) >> "$objtree/debian/hdrsrcfiles"
 fi
-(cd $srctree; find arch/$SRCARCH/include include scripts -type f) >> "$objtree/debian/hdrsrcfiles"
+(cd $srctree; find arch/*/include include scripts -type f) >> "$objtree/debian/hdrsrcfiles"
 (cd $srctree; find arch/$SRCARCH -name module.lds -o -name Kbuild.platforms -o -name Platform) >> "$objtree/debian/hdrsrcfiles"
 (cd $srctree; find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f) >> "$objtree/debian/hdrsrcfiles"
 (cd $objtree; find arch/$SRCARCH/include Module.symvers include scripts -type f) >> "$objtree/debian/hdrobjfiles"